# What determines how long it rains?

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## What determines how much it rains?

Factors controlling the distribution of rainfall over the earth’s surface are the belts of converging-ascending air flow (see doldrums; polar front), air temperature, moisture-bearing winds, ocean currents, distance inland from the coast, and mountain ranges.

## What determines the rate and size of falling rain?

What determines the rate and size of falling rain? Availability of water vapor and intensity of updrafts within a cloud determine the size of a raindrop. Larger drops tend to result from the vigorous updrafts within a thunderstorm and fall faster than smaller drops.

## What causes days of rain?

Within a cloud, water droplets condense onto one another, causing the droplets to grow. When these water droplets get too heavy to stay suspended in the cloud, they fall to Earth as rain. … Water vapor turns into clouds when it cools and condenses—that is, turns back into liquid water or ice.

## How likely is it to rain with a 30 chance?

The POP is equal to the percent confidence multiplied by the percent coverage. Yes, it is an actual mathematical equation! For example, a 30 percent chance of rain may mean 100 percent confidence that only 30 percent of the forecast area is going to get rain. Days like that, we say isolated showers.

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## What dictates raindrop size?

Condensation occurs when the water vapor wraps itself around the tiny particles. Each particle (surrounded by water) becomes a tiny droplet between 0.0001 and 0.005 centimeter in diameter. (The particles range in size, therefore, the droplets range in size.)

## At what speed does a raindrop fall?

When all the parameters are considered the terminal velocity of a typical raindrop is calculated to be about 9 meters per second or 20 mph. A smaller raindrop of radius 0.15 cm has a terminal velocity of about 7 meters per second or 16 mph.

## How far does the average raindrop fall?

We shall assume a cloud base of 2,000 feet. The largest raindrops, those associated with thunderstorms, are 0.2 inches in diameter and they fall at about 20 mph. If the base of the cloud from which they are falling is at 2,000 feet above your head, it takes those drops 1.1 minutes to reach the ground.

## Why does it rain harder at night?

Air is generally cooler at night, and cool air holds less moisture than warm air resulting in rainfall.

## Can a cloud burst?

A cloudburst is an extreme amount of precipitation in a short period of time, sometimes accompanied by hail and thunder, which is capable of creating flood conditions. … The term “cloudburst” arose from the notion that clouds were akin to water balloons and could burst, resulting in rapid precipitation.

## Is it possible to make it rain?

Farmers have long wished they could control the rain, and now weather manipulation can do just that. Cloud seeding, the most common way to modify weather, involves shooting silver iodide or other chemicals into clouds to encourage precipitation. In other words, a silver bullet can make it rain.

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